HQRP Humidifier Wick Filter traps impurities in the water and promote a healthier environment. The package contains 2 wick filters. Compatible with Sears Kenmore 29974, 299740, 29962, 758.299772C, 758.144131, 758.144510, 758.14451, 758.29974, 758.299740 Humidifiers; part 14909 / 14912 / 32-14912 / 42-14912 / 32-14909 / 42-14909 / 42-29962 Replacement. Replace your Humidifier Filter about every 2-3 months (under normal use) for optimum performance and maximum humidity output.